Scala example source code file (MonadPlusTest.scala)

This example Scala source code file (MonadPlusTest.scala) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Scala by Example" ^TM.

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

both, failure, list, monadplustest, speclite, stream, string, that, vector

The MonadPlusTest.scala Scala example source code

package scalaz

import std.AllInstances._
import std.option.{some, none}

object MonadPlusTest extends SpecLite {

  "unite" in {
    MonadPlus[List].unite(List(some(1), none[Int], some(2))) must_===(List(1, 2))
  }

  "uniteU" in {
    MonadPlus[List].uniteU(List(\/.right(1), \/.left("a"), \/.right(2))) must_===(List(1, 2))
  }

  "separate" in {
    import \&/._
    import syntax.monadPlus._

    List(\/.right(1), \/.left("a"), \/.right(2)).separate must_===(List("a") -> List(1, 2))

    List(1 -> "a", 2 -> "b").separate must_===(List(1, 2) -> List("a", "b"))

    Vector[Int \&/ String](This(1), Both(3, "a"), That("b")).separate must_===(Vector(1, 3) -> Vector("a", "b"))

    Stream(Success(1), Failure("a"), Success(2)).separate must_===(Stream("a") -> Stream(1, 2))
  }

  "filter" in {
    MonadPlus[List].filter(List(1, 2, 3))(_ % 2 == 0) must_===(List(2))
  }
}